Question

The gravitational potential due to a hollow sphere (mass $M$, radius $R$) varies with distance $r$ from centre as

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

$v_g=-\frac{GM}{R}$
for $r\le R$ and $v_g=-\frac{GM}{r}$,
for $r>R$, and
so option $(b)$ is correct.